The question of whether buy a motorboat Ob MThe model, which is an upgrade of the legendary Ob, has become a true symbol of domestic shipbuilding for small rivers and lakes. The aluminum hull, the ability to keep the wave and the ability to install a powerful outboard motor make it attractive to a wide range of users, but this boat has its own features that must be considered before buying.
The modern market offers many alternatives, including composite materials and imported alloys, but Ob M remains popular due to its maintainability and availability of spare parts. If you are considering buying a used boat or a new boat from canning, you will have to weigh the pros and cons. In this article, we will examine in detail the design features, real performance and hidden nuances of operation, which are often silent sellers.
It is important to understand that the purchase of such a vessel is not just a transaction, but an entrance to the club of owners who know how to service aluminum. Duraluminium D16ATThe corrosion system is highly durable, but it requires careful attention to electrochemical corrosion, so let's look at what the name M is and why it's still relevant in 2026-2026.
Design features and differences from its predecessor
The upgraded version of the Obie, which received the M index, was designed to take into account errors identified during the operation of the base model. The main visual and structural difference is in the shape of the nose and transom. While the classic Ob had more rounded contours, the M version received a sharper (sharp) cheekbones and a changed angle of kilewattivity, which positively affected the performance of the excitement.
Train boat Ob M. It is designed to be equipped with engines up to 30 hp, although many owners have the courage to put 40 hp units, taking care, thanks to the increased height of the bow and the changed geometry of the bottom. Aluminum sheets are connected by argon-arc welding, which ensures high sealability of the seams, but welded joints are areas of increased risk when improperly operated.
⚠️ Attention: When you look at a used boat, pay special attention to the internal seams in the bow, which is where microcracks occur most often due to shock loads on the wave.
Inside the cockpit are runduks, which serve not only for storing things, but also serve as structural elements of rigidity. Deck flooring It's made of corrugated aluminum, which prevents slipping, but in cold weather it can be uncomfortable for the feet without special shoes. The dimensions of the boat make it easy to transport on a light trailer, and the light weight makes it easier to descent by hand.
Technical details of welding
The welds on Ob M boats are automatically welded in the argon environment, which allows for deep welding, but makes the metal in the seam zone more sensitive to corrosion if the surface passivation technology after welding is broken.
Driving qualities and controllability on water
One of the main reasons why many people decide buy the boat Obi MIt's a very strong, high-powered model, which is its ability to feel confident in large water, and unlike flat-bottom models, it has a very strong bottom keel, which allows it to stay off course and to carry the side wave more easily, but it pays for that with increased water resistance at low speeds.
When going to planing, the boat behaves predictably, but requires proper weighting. Centre of gravity It is shifted closer to the transom, so when fully loaded (2-3 people plus equipment), the boat can be too nose-driven in the wave if passengers sit on the aft cans. The optimal load for a comfortable and fast ride is two people and a 15-20 hp engine.
- 🌊 Wave resistance: The boat confidently holds a wave height of 0.5 meters, which allows you to go to large reservoirs.
- ⚓ Stability of course: Thanks to the keeled bottom, the boat perfectly keeps a straight course, requiring minimal steering work.
- 🔄 Maneuverability: At low speeds, the turning radius is large, which is typical for all keel aluminum boats with a flat forehead.
It is worth noting that on full gas with one driver, the boat may exhibit a tendency to dolphin (rhythmic nodding with the nose), this is treated by installing transboards or properly installing them. outboard Adjusting the angle of the engine's trim also plays a critical role in achieving maximum speed and fuel economy.
To improve driving performance and reduce yaw, install small hydrowings or transom plates on the cheekbones, which is especially true when operating with engines less than 15 hp.
Corrosion problems and durability of the body
The most painful issue for owners of duraluminium boats is electrochemical and intercrystalline corrosion. Duraluminium D16AT Unlike amg-5, which is often used in modern boats, dural requires mandatory protection. buy a motorboat Ob M b/y, the condition of the body should be the main criterion for evaluation.
Corrosion is most common in the welded seams and floorboards. The inner surface of the cockpit is often affected by moisture accumulated under rubber mats or at the corners of rundooks. The outer part, which is in constant contact with water, requires regular treatment with anti-corrosion compounds. Many owners resort to zinc treads, but their effectiveness in fresh water is limited.
| Type of exposure | Risk zone | Symptoms | Method of prevention |
|---|---|---|---|
| Electrochemical corrosion | Drink, truncheon | White plaque, sores. | Zinc treads, insulation |
| Intercrystalline corrosion | Welding zones | Metal stratification, cracking | High-quality welding, painting |
| Mechanical abrasion | Cheeses, keel | Thinning of the skin | Kevlar ribbon, armour plates. |
Keeping the boat in the water for the whole season without special corrosion treatment and protection is a sure way to destroy the hull in 3-4 years. Aluminum does not rust like steel, but it “blooms” and loses strength, turning into a powdery mass. If you see swollen paint with white powder underneath on a used boat, this is a bad sign.
Operational costs and maintenance
Buying a boat is just the beginning of a financial investment. Obi M. It requires regular costs that beginners often underestimate, especially in painting. Factory coating (if it is preserved) does not last long, and after a couple of seasons there is a question of repainting the entire hull. The use of quality yacht enamels and soil significantly increases the budget of ownership.
Fuel efficiency is directly dependent on the condition of the bottom. Swallowing with algae or the appearance of seashells (in the southern regions) dramatically increase resistance. Regular washing and treatment with anti-fouling compounds (for aluminum!) are mandatory. Also, the cost should include the purchase or rental of a trailer, since the size of the boat does not allow it to be carried on the roof of a passenger car without special training.
Repairability is the strength of the model. Aluminum is easy to boil, breakages and cracks are eliminated in any workshop working with non-ferrous metals. Interior parts (banks, runduks) can be made independently or ordered from private craftsmen, making operation independent of the manufacturer.
- 💰 Cost of paint: A high-quality system (ground + enamel) for a full case will cost 15-25 thousand rubles (materials).
- ⛽ Fuel consumption: At a speed of 25-30 km / h, the 15 hp engine consumes about 6-8 liters per hour.
- 🔧 Repair: Local crack welding costs from 3 to 10 thousand rubles, depending on the complexity of access.
⚠️ Warning: Never use copper-containing paints (such as some types of anti-fouling paints for marine vessels) on an aluminum hull, which will cause instant and irreversible galvanic corrosion.
Comparison with competitors: Ob M or Kazanka M?
The eternal dispute of water engines: which is better, Ob or Kazanka? Ob M. The first one is more seaworthy and comfortable on the wave, the Kazanka is narrower and roller, although it is faster to glid with low-power engines, while the Ob gives a sense of greater security thanks to high sides and a wide cockpit.
On the other hand, Kazankas are often made from the more corrosion-resistant AMG alloy, although this is not a panacea. The Obi M weighs slightly more, which affects transportation. If you choose between these two legends, you should be guided by operating conditions: for large bodies of water and wind, it is better to use it. ObFor quiet lakes and rivers with strong currents and the need for frequent troughs, Kazanka.
The table below compares the key specifications:
| Characterization | Ob M. | Kazanka-M | Comments |
|---|---|---|---|
| Length, m | 4.50 | 4.00 | It's roomier. |
| Width, m. | 1.60 | 1.60 | Parity |
| Mass, kg | 190 | 145 | It's 45kg heavier. |
| Passengers | 4 | 4 | Formally equally |
Ob M is a choice in favor of comfort and seaworthiness, Kazanka-M - in favor of ease and economy.
What to look for when buying a used boat
If you've decided buy the boat Obi M Your job is to find a live case. Visual inspection starts at the bottom. Ask the seller to turn the boat over or look under it. Look for paint bloating, especially along the seams. White powder plaque is a sign of active corrosion. Light tapping of the knuckles on the body can reveal stratifications: sound must be ringing, deaf sound indicates problems.
Inside the cockpit, look at the corners, the mounting points of the cans and floorboards. Often the corrosion is hidden under rubber seals or wooden linings. Check the transom for deformities — if it walks, it means that the boat was operated with an overpowered motor or without transmutation plates. Also note the presence of factory plates: their absence or indiscriminateness will create problems when registering with the GIMS.
☑️ Checklist check-in of used boat
Don't forget to check the equipment. The lack of regular floorboards, cans or windshield is a bargaining chip, because it can be difficult to find original parts on an old boat. Also, check the storage history: if the boat was standing in the open air and gaining water, its resource is significantly reduced.
FAQ: Frequently asked questions
Can I put a 30 hp engine on the Ob M?
Formally, the passport power is limited to 15-20 hp, but the reinforced transom allows you to put engines up to 30 hp However, you need to strictly monitor the weighting and not exceed the recommended load, as this affects stability and safety.
How to protect OBM from corrosion?
Special soils for aluminum (such as AP or VL), regular inspection of the hull, removal of contaminants and storage of the boat in a dry place, installation of zinc treads gives only a temporary effect on fresh water.
Do I need to register with GIMS for Ob M?
Yes, the boat is subject to mandatory registration, as its weight (190 kg) exceeds 200 kg in running order (including the weight of the engine), and the length of more than 4.5 meters.
What is the maximum speed of the boat OBM?
With a motor of 20 hp and full load speed is about 35-40 km / h With one driver and engine 30 hp can accelerate to 45-50 km / h, but a comfortable speed is 30-35 km / h.
Where can I buy a new boat, Obi M?
New boats can be found at dealers in Novosibirsk (the production site) or in major cities in Siberia, and there are private replica workshops, often selling "new" storage boats (NZP), which can be as old as 10-20 years.